p33 066

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66. The effective resistance R

eff

satisfies I

2

rms

R

eff

= P

mechanical

, or

R

eff

=

P

mechanical

I

2

rms

=

(0.100 hp)(746 W/hp)

(0.650 A)

2

= 177 Ω .

This is not the same as the resistance R of its coils, but just the effective resistance for power transfer
from electrical to mechanical form. In fact I

2

rms

R would not give P

mechanical

but rather the rate of energy

loss due to thermal dissipation.


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